Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Maintenance of remission
Systematic review 4-armed trial	80 people with severe psoriasis Data from 1 RCT	Percentage changes to Psoriasis Area and Severity Index (PASI) scores 6 months with acitretin (10, 25, and 50 mg/day) with placebo Absolute results not reported	Reported no significant different between placebo and acitretin (any dose) People were also allowed to use 0.1% difluacortolone valerate ointment		Not significant